Brake drum assembly



4 Dec. 28., 1948. v w. D. DAVIDSON 294579352 BRAKE DRUM AS SEMBLY Fil edDc. 11, 1944 WILLIAM D. DAVIDSON 3maentor C(ttorneg Patented Dec. 281948 to Ems'co. Derrick & E'q

uipment Company; has

Angelo s, Califi, a corporation of Qaliforni'a- Application December 11,race. seams. 567,553

This invention relates to spooling, and drum as} semblies which areadapted to handle. heavy spooling and braking loads. One of the usefulapplications of the. invention is. in the well drilling industry,wherein it is, customary to employ hoisting mechanism, embodyingcombined brakiing and spooling mechanisms, for handlingv drill pipe.Such use imposes heavy loads on both the spooling and brakingmechanisms, and the brake rims are. subject to considerable. wear andmust be occasionally replaced.

One of the objects of the invention is to pro vide a combined. brakingand spooling assembly which is extremely rugged and has an improvedcapacity for handling the torque loads imposed upon it, althoughconstructed in such a manner as to permit the brake rims to be readilyremoved for'repa'ir or replacement. "As one aspect of this generalobject, the radial flange of the brake rim, by means of which the rim isdetachably mounted upon a supporting wheel, is secured. to thesupporting wheel at a maximum radius. from the axis of the assembly, soto reduce to a, minimum the torque load upon. the keyed connection, inproportion to the torque load applied to the brake rim. Another featureof the invention which is directed to the accom plishment of thisobject, is the placement of the bolts by means of which the rim ismounted on the hub wheel, in double-shear between the rim flange, thehub wheel, and a ring which clamps the rim flange against the hub wheel,and the location of these bolts at a maximum radius from the axis of theassembly, in order to reduce the torque load thereon to a minimum.

This arrangement makes it possible to make the rim flange and theclamping ring sufi'iciently large in internal diameter to pass freelyover the sprocket gears and clutch, through which the assembly isdriven, and it is accordingly a further object of the invention toprovide a braking and spooling assembly in which the rim, the rimflange, and the clamping ring are adapted to freely pass over the drivemechanism of the assembly in order to facilitate repair and replacementof the rim.

Another aspect of the invention, directed toward the general objects ofproviding a rugged assembly is the utilization of a single wheel memberhaving a heavy integral hub, for supporting each end of the spoolingdrum and for supporting one of the brake rims.

A further object of the invention is to provide a spooling and brakingassembly in which the brake rim, although separable for repair and rerClaim. (01. lac-ms) placement purposes, is securely held. againstflying: apart. in the. event it should. become broken. Further objects.and; advantages at the invention will bebrollght out in the followingpart of the specification.

Referring tothe drawings which are. for illustratlvepurposes only,

Fig. l. is; atransverse sectional view of a brake and spooling drumassembly embodying the invention;

Fig. 2- is adetailed sectional view of the same taken on. theline 2--2.of 1;. and; 31s a detailed.- sectional view taken on the line 3--3 ofFig. 1. The. improved; brake. andspocling. drum mechanism in which my,invention is. embodied comprises abralge: wheel. 6. mounted upon a shait8 which. is adapted; to be driven by any suitable means from a suitablesource or power- The brake wheel 6 is provided with a heavy, onepiecehuh ll which is. keyed, as at 2, to the shaft 81 The periphery ot thebrake: wheel 6. carries'a a y e n ing fiance is and a clamping ring Ill:whichttcrml in effect a pair of. axially spaced clamping members adaptedto receive between them the ratlially inwardly extending flange I8 ofthe brake rim [9. The clamping ring I? is separable from the brake wheel6, but is keyed thereto by means of keys 2| secured as by welding to thewheel 6 and projecting into notches 22 in the clamping ring 11.Consequently, the bolts 23, by means of which the clamping ring I! andthe flangesalfi and I8 are secured in assembly, are under double shearin transmitting torque between the brake rim l9 and the wheel 6. Thatis, the bolts 23 cannot become canted under the torque load which theycarry, since the opposed bolt openings in the flange l6 and clampingring I! are always maintained in alignment by the keyed connectionbetween the flanges l6 and clamping ring I1, and torque loads betweenthe flange l8 and the brake wheel will result in shearing action on bothsides of the rim flange I8. The bolts 23 are arranged in double rows asshown in Fig. 1 and the nuts 24 thereof are drawn up tightly so as toimpose compressive frictional engagement between the inner faces of theflange l6 and the clamping ring l1 and the respective sides of theflange l8. The double row arrangement of the bolts produces a maximumdegree of clamping engagement which resists any tendency of portionsof'the brake rim I9 to fly outwardly under the effect of centrifugalforce in the event the rim should become split or cracked in use.

The rim is supported further against such outward movement by a dishedperipheral flange 26 on the flange I6, having an inner shoulder surface21 to snugly flt the curved shoulder surface 28 between the rim properand the flange l8 of the rim IS. The axial end surface of the flange 2Bis squared oil as at 29 to form one side extremity of the channel 3|which receivesthe brake band (not shown}. f The other side pi thechannel 3 I is defined by a radially outwardly extending flange 32 onthe extremity of the rim l9.

formed integrally with the brake wheel 6;'and

project radially outwardly through notches 34 (Fig. 1) in the axialflangej35 formed on each of the brake wheels. The flange 35 forms apiloting seat for the inner periphery of the rim" flange l8.

and facilitates assembly of the rim upon the brake wheel. The flange 35also forms a piloting seat for the removable clamping ring l1, andfacilitates assembly of the latter over the flange la. The innerperipheries of the clamping ring lfl and flange 18 are thus slightlylarger in dlameter'than the outer diameter of the flange 35, in orderthat they may be freely slipped thereo'ven,

Since the keys 2| extend outwardly beyond the inner diameter of theflange l8, thelatter is provided with notches 36 adapted to receive thekeys 2| in order that the flange l8 may pass the keys when it is beingassembled. j

The inner diameters of the clamping ring I! and flange l8 are suflicientto permit the brake rim and the clamping ring to pass over any clutchesor driving gears which may be connected to shaft 8. r

The employment of a relativelylarge internal diameter for theclampingring l1 and the flange I8 is accompanied by arrangementof thetorque transmitting bolts 23 well outward toward the outer diameter ofthe brake wheel 6, and also the arrangement of the keyed torquetransmitting connection between the flange l6 and clamping ring I! wellaway from the torque axis and relatively nearthe bolts 23. Thisredu'cesthe torque verage'against the torque transmitting connectio'nto aminimum, andthereby increases" the torque load capacity of the brakeassembly. As a result of this arrangement, it is possible, if desired,to reduce the number of keyed connections between the flange L6 andclamping ring IT to a single connection for each of the brake drumassemblies. A further advantage of the arrangement is the reduction to aminimum of circumferential play between the flange l6 and clamping "ringH, which would permit the bolts to cant, and thereby detract from theeffectivev .ness of the double-shear transmission of torque. The keys 2|are welded upon raised lugs 33 and the overhanging supporting engagementwith the dished flange '26.

I claim as my invention: A brake drum assembly comprising a brake wheelprovided with a radially extending wheel flange, a circularflangeintegral with said wheel flange and extending axially from asidesurface thereof, a brake rim having a radially inwardly extendingbrake flange engaging the side surface of said wheel flange andsurrounding said circular flange, a clamping ring having a notched innerperiphery surrounding said circular flange and engaging said brakeflange, a key secured to said circular flange in spaced relationship tosaid side surface of said wheel flange and extending radi ally into anotch in the inner periphery of said clamping ring to lock said clampingring and said wheel flange against relative rotation, and a. pluralityof bolts extending through .said wheel flange, said brake flange andsaid clamping ring.

WILLIAM D. DAVIDSON.

: file of this patent: I

UNITED STATES PATENTS Number Name Date 1,874,574 Morgan Aug. 30, 19321,995,697 Whitacre Mar. 26, 1935 2,057,725 La Brie Oct. 20, 1936

